Another report and some thoughts below

HW: Asus Vivobook (touchscreen, Intel graphics), external monitor attached.
OS: Linux Mint 18 Cinnamon x64.
State before crash: Running X session using both displays ("big desktop"), 
several applications, Vivaldi browser active.
My aim: Lock the computer.
Course of action, the USUAL part: Pressed Ctrl+Alt+L, not locked - Vivaldi 
displayed its menu (to be displayed upon pressing Alt), tapped the touchscreen 
to get rid of the menu and thus actually lock the computer.
Course of action, the UNUSUAL part: Black screen for a few seconds, then login 
screen, old X session gone.

syslog:
Mar 20 14:43:20 VivoBook org.a11y.atspi.Registry[1729]: XIO:  fatal IO error 11 
(Resource temporarily unavailable) on X server ":0"
Mar 20 14:43:20 VivoBook org.a11y.atspi.Registry[1729]:       after 2925 
requests (2925 known processed) with 0 events remaining.
Mar 20 14:43:20 VivoBook cinnamon-session[1640]: Gdk-WARNING: t+4492,79569s: 
cinnamon-session: Fatal IO error 11 (Prostředek je dočasně nepřístupný) on X 
server :0.
Mar 20 14:43:20 VivoBook org.gtk.vfs.Daemon[1711]: A connection to the bus 
can't be made
Mar 20 14:43:20 VivoBook org.gtk.vfs.Daemon[1711]: A connection to the bus 
can't be made
Mar 20 14:43:20 VivoBook mdm[1212]: WARNING: mdm_slave_xioerror_handler: 
Kritická chyba X - Restartování :0
Mar 20 14:43:20 VivoBook kernel: [ 4538.677519] vivaldi-bin[4100]: segfault at 
968 ip 00007f61ac384643 sp 00007ffc09f25b50 error 4 in 
libX11.so.6.3.0[7f61ac35c000+135000]
Mar 20 14:43:20 VivoBook ag[4118]: mdm-superpost Starting...
Mar 20 14:43:20 VivoBook ag[4122]: mdm-superpost Finished
Mar 20 14:43:20 VivoBook console-kit-daemon[1566]: (process:4128): 
GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Mar 20 14:43:21 VivoBook acpid: client 1219[0:0] has disconnected
Mar 20 14:43:21 VivoBook acpid: client connected from 4131[0:0]
Mar 20 14:43:21 VivoBook acpid: 1 client rule loaded
Mar 20 14:43:22 VivoBook ag[4139]: mdm-superinit Starting...
Mar 20 14:43:22 VivoBook ag[4140]: mdm-superinit Finished

Xorg.0.log covers the new session, Xorg.0.log.old has no record of the
event.

The segfault really seems to affect multiple users, especially with 
Chromium-based browsers, e.g.:
https://bbs.archlinux.org/viewtopic.php?id=131328 - from 2011 already
https://bbs.archlinux.org/viewtopic.php?id=221888 - solution?

I don't know if syslog preserves the order of events (within a second), but if 
yes, then the segfault is just a consequence of another problem, e.g.:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/999191

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to libx11 in Ubuntu.
https://bugs.launchpad.net/bugs/1636564

Title:
  Segfault from libX11.so.6.3.0

Status in libx11 package in Ubuntu:
  Confirmed

Bug description:
  Something went wrong with my Ubuntu 16.04 LTS desktop today.  When I
  got back to the system Mattermost and a Chrome were indicating that
  the network was not working.  I started to look about and it seemed
  that my main ethernet network connection had lost its IPv4 address
  somehow.  ifconfig and the GUI network manager confirmed this.

  To try and resolve this I physically removed the connector and the
  plugged it back in.  Shortly after I did this my GUI seemed to die out
  and I ended up back at the login screen.

  Once everything had calmed down I logged back in.  After some digging
  about in the logs I noticed the following in /var/log/kern.log

  Oct 25 13:01:09 thorne-ul-dt kernel: [694321.877561] Mattermost[744]: 
segfault at 968 ip 00007f8a9e257643 sp 00007ffe72a3b510 error 4 in 
libX11.so.6.3.0[7f8a9e22f000+135000]
  Oct 25 13:01:09 thorne-ul-dt kernel: [694322.029362] chrome[745]: segfault at 
968 ip 00007fd4b5c73643 sp 00007fff94f78d90 error 4 in 
libX11.so.6.3.0[7fd4b5c4b000+135000]

  That seemed to be the correct time for the problem I noticed.   What
  exactly caused it I am not sure.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: libx11-6 2:1.6.3-1ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
  Uname: Linux 4.4.0-42-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Oct 25 17:07:28 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v3/4th Gen Core 
Processor Integrated Graphics Controller [1458:d000]
  InstallationDate: Installed on 2015-03-12 (592 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 
(20150218.1)
  MachineType: Gigabyte Technology Co., Ltd. H81M-DS2V
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-38-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash crashkernel=384M-:128M 
vt.handoff=7
  SourcePackage: libx11
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/11/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F6
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H81M-DS2V
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF6:bd08/11/2015:svnGigabyteTechnologyCo.,Ltd.:pnH81M-DS2V:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH81M-DS2V:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: H81M-DS2V
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Tue Oct 25 13:01:04 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               30926 
   vendor                                     BNQ
  xserver.version: 2:1.18.4-0ubuntu0.1

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